Disclaimer. Solar Ionization Cannons are giant laser pointers that fire condensed light waves. They bypass shields because they do not utilize -particles- in any manner and directly heat the surface of a ship they are fired upon. If your technology utilizes gas, particles, antimatter, exc, calling them Solar Ionization Cannons doesn't make said weapon bypass shields.
Apparently, I had entirely misunderstood what the Mandalorian Empire was as a faction. The Lore Codex has done a great job of catching me up on what I've missed while working 60-70 hours a week for the past year. But man... Does this complicate how I should be viewing and interacting with said faction.